Python matplotlib：在线宽点和转换之间转换？
在许多情况下，我发现在图形上放置方轴很方便，这样我就可以轻松地在Python matplotlib：在线宽点和转换之间转换？,python,matplotlib,Python,Matplotlib,在许多情况下，我发现在图形上放置方轴很方便，这样我就可以轻松地在transAxes单元中工作，而不必担心图形的纵横比。然而，我遇到的一个问题是，当你画一条线时，线宽从路径的任意方向延伸lw/2点。当然，这是正常的、预期的行为，但它会导致一个问题，即如果我试图在某些轴上刻一些东西（并使用边界框中的所有空间），这些线将剪切到轴的边缘。我可以设置clip\u on=False，但这只会使我试图在轴上刻下的图形超出轴的边界。我的问题是-如何在“线宽”规格（以点为单位）和转置单位之间进行转换，以便补偿形状
transAxeslw/2clip\u on=False转置"""
MWE demonstrating the cliping of linewidths that are inscribed in axes.
"""
from __future__ import division
from matplotlib.pyplot import figure, show, savefig
from matplotlib.pyplot import Circle
from matplotlib.lines import Line2D
# Make a figure
(fig_w, fig_h) = (7.5, 2.5)
cdpi = 150
fig_aspect = fig_h/fig_w
fig = figure(1, figsize=(fig_w, fig_h), dpi=cdpi)
# Helper functions to center the circles
get_w_from_h = lambda h: h*fig_aspect
get_b_from_h = lambda h: (1-h)/2
get_l_centered = lambda left, span, w: left+(span-w)/2
# Left circle 1 - The line at the center shows that lw is the same number of pixels no matter
# what transform you use.
l_h = 0.25
l_w = get_w_from_h(l_h); l_b = get_b_from_h(l_h)
l_l = get_l_centered(0, 1/3, l_w)
l_box = [l_l, l_b, l_w, l_h]
lcax = fig.add_axes(l_box)
lclw = 2.0
lcirc = Circle((0.5, 0.5), 0.5, lw=lclw, color='#FF3932', fill=False, transform=lcax.transAxes)
lline = Line2D([-0.5, 1.5], [0.5, 0.5], lw=lclw*4, color='#FF3932',
dashes=[5,1e-14,1e-14, 5], clip_on=False, transform=lcax.transAxes)
lcax.add_patch(lcirc)
lcax.add_line(lline)
lcax.axis('off')
# Left Circle 2
l_h2 = 0.75
l_w2 = get_w_from_h(l_h2); l_b2 = get_b_from_h(l_h2)
l_l2 = get_l_centered(0, 1/3, l_w2)
l_box2 = [l_l2, l_b2, l_w2, l_h2]
lcax2 = fig.add_axes(l_box2)
lcirc2 = Circle((0.5, 0.5), 0.5, lw=lclw, color='#b20500', fill=False, transform=lcax2.transAxes)
lline2 = Line2D([0.1, 0.9], [0.5, 0.5], lw=lclw*4, color='#b20500',
dashes=[1e-14,5,5, 1e-14], transform=lcax2.transAxes)
lcax2.add_patch(lcirc2)
lcax2.add_line(lline2)
lcax2.axis('off')
# Middle circle
m_h = 0.9
m_w = get_w_from_h(m_h); m_b = get_b_from_h(m_h)
m_l = get_l_centered(1/3, 1/3, m_w)
m_box = [m_l, m_b, m_w, m_h]
mcax = fig.add_axes(m_box)
mclw = 4.0
mcirc = Circle((0.5, 0.5), 0.5, lw=mclw, color='b', fill=False,
clip_on=False,
transform=mcax.transAxes)
mcax.add_patch(mcirc)
mcax.axis('off')
# Right circle 1
r_h = 0.75
r_w = get_w_from_h(r_h); r_b = get_b_from_h(r_h)
r_l = get_l_centered(2/3, 1/3, r_w)
r_box = [r_l, r_b, r_w, r_h]
rcax = fig.add_axes(r_box, zorder=1)
rclw = 2.0
rcirc = Circle((0.5, 0.5), 0.5, lw=rclw, edgecolor='k', facecolor='#4E4E4E',
fill=True, transform=rcax.transAxes)
rcax.add_patch(rcirc)
rcax.axis('off')
# Right circle 2
r_h2 = 0.5
r_w2 = get_w_from_h(r_h2); r_b2 = get_b_from_h(r_h2)
r_l2 = get_l_centered(2/3, 1/3, r_w2)
r_box2 = [r_l2, r_b2, r_w2, r_h2]
rcax2 = fig.add_axes(r_box2, zorder=2)
rcirc2 = Circle((0.5, 0.5), 0.5, lw=rclw, edgecolor='none', facecolor='#BBBBBB',
fill=True, transform=rcax2.transAxes)
rcax2.add_patch(rcirc2)
rcax2.axis('off')
savefig('ClippingMWE.png', transparent=True, dpi=cdpi)
lwtransAxes